Like the MD, the Martin Impact Cradle LD conforms to CEMA No. 502-1998 & 575-2000, but the Class L design is made for lighter materials with impact forces that could still affect the belt and conveyor over time. Utilizing the same impact bar technology, it is able to withstand a maximum weight of 8,500 ft./lbs. (37.8 kN), equal to 50lbs. (22 ...Web